Compilare: main.cpp: In function 'int main()': main.cpp:17:13: warning: unused variable 'j' [-Wunused-variable] int n,i,j,dmin,k,x,y,cost,m,s,nodc,f; ^ main.cpp:17:20: warning: unused variable 'k' [-Wunused-variable] int n,i,j,dmin,k,x,y,cost,m,s,nodc,f; ^ main.cpp:19:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ main.cpp:28:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&x,&y,&cost); ^